//less通用颜色变量

@c33: #333;
@cff: #fff;
@cf5: #f5f5f5;
@cf3: #ddd;
@fc9: #FFCC99;
@666: #666;
@fontc: #e44a2f;

//清除浮动
.clear {
    &::after{
        content: '';
        height: 0;
        width: 0;
        display: block;
        clear: both;
    }
}